Fuel Pump Relay

I took my car to a shop because it wouldn't start...the mechanic said it was the fuel pump relay. He "fixed" it so it would start, but half of the time it idles soo low that I have to give it some gas for the car to start. Is this possible? I thought it would have to be replaced...I don't think he did so. What is the marking in the fuse box? I looked and I didn't see anything marked "fuel pump relay"...
 
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